Filter for vacuum-pumping system and vacuum-pumping system

Abstract

The invention discloses a filter for a vacuum-pumping system and the vacuum-pumping system. The filter comprises a filter shell, and an end cover is detachably arranged at one end of the filter shell; the multi-stage filtering device comprises an inserting cylinder arranged at one end of the end cover, a metal net, an activated carbon net and high-density sponge which are sequentially arranged on the inner wall of the inserting cylinder, threaded grooves symmetrically formed in one end of the end cover, fixing lugs symmetrically arranged on the outer wall of the filtering shell, and penetrating holes formed in the fixing lugs; the multi-stage filtering device has the beneficial effects that through the designed multi-stage filtering device, the metal net can filter out large-particle impurities, the activated carbon net can adsorb peculiar smell and part of small-molecule impurities in gas, the high-density sponge can further filter out small impurities, and the filtering effect is improved through multi-stage filtering; the micro pressure sensor is additionally arranged, so that gas pressure before and after filtering can be monitored respectively, and data support is provided for judging whether a filtering part needs to be replaced or not.

Description

Technical Field

[0001] This invention belongs to the field of vacuum technology, specifically relating to a filter and a vacuum system for use in vacuum systems. Background Technology

[0002] Vacuum systems are widely used in industrial production, scientific experiments and other fields. During operation, the vacuum system extracts gas from the container. To ensure the normal operation of the vacuum pump and the quality of the vacuum environment inside the container, the extracted gas needs to be filtered to remove impurities.

[0003] A filter for a vacuum system, disclosed in patent publication number CN218107126U, includes a housing and a connecting plate. Both the housing and the connecting plate have externally threaded rings fixedly connected to their respective ends. A connecting sleeve is threaded onto the outer side of the externally threaded rings. Several handles are rotatably connected to one side of the connecting sleeve. Several slots are fixedly connected to the outer side of one end of the housing. A connecting pipe is threaded onto one side of the housing. A partition plate is fixedly connected to one end of the connecting pipe. A placement groove is fixedly connected to one end of the partition plate. A second partition plate is fixedly connected to one side of the placement groove. An isolation sleeve is fixedly connected inside the housing. The first partition plate and the placement groove are located inside the isolation sleeve, and filter cotton is placed in the placement groove.

[0004] Currently, the filters used in vacuum systems typically employ only a single type of filter cotton, resulting in limited filtration efficiency and failing to meet the demands of high-precision filtration. Furthermore, determining whether the filter cotton is clogged and when to replace it relies entirely on manual observation and experience, which is not only inefficient but also prone to errors. When the filter cotton is severely clogged and not replaced in time, it can lead to a decrease in vacuum efficiency, affecting the normal operation of the system and potentially damaging the vacuum pump. On the other hand, replacing it too early would result in a waste of filter cotton and increased costs. Summary of the Invention

[0005] The purpose of this invention is to provide a filter and a vacuum system for use in a vacuum system, which solves the problems of poor filtration effect of existing vacuum systems and reliance on manual judgment for filter cotton replacement.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a filter for a vacuum system, comprising...

[0007] A filter housing, one end of which is detachably fitted with an end cap;

[0008] A multi-stage filtration device includes a tube disposed at one end of an end cap, a metal mesh, an activated carbon mesh, and a high-density sponge sequentially disposed on the inner wall of the tube, threaded grooves symmetrically disposed at one end of the end cap, fixing ears symmetrically disposed on the outer wall of the filter housing, a through hole opened inside the fixing ear, a threaded rod passing through the through hole, and a threaded cylinder fixedly disposed on the side surface of the fixing ear. The threaded rod is threadedly connected to the threaded cylinder, and the threaded rod is threadedly connected to the threaded groove.

[0009] Two miniature pressure sensors are provided, one of which is installed on the filter housing and the other on the end cap.

[0010] As a preferred embodiment of the present invention, it further includes a through-hole opened inside the end cap, and a limiting ring installed on the inner wall of the through-hole to limit the movement of the high-density sponge.

[0011] As a preferred technical solution of the present invention, it further includes positioning blocks symmetrically arranged on the end cap, and positioning grooves symmetrically opened on the filter housing that are adapted to the positioning blocks.

[0012] As a preferred embodiment of the present invention, the insert and the end cap are an integral structure, and the threaded cylinder and the fixing lug are connected by screws.

[0013] As a preferred technical solution of the present invention, the fixing ear and the filter housing are welded together, and the perforation and the threaded groove are at the same height.

[0014] The present invention also discloses a vacuum system, including a filter, a container and a vacuum pump connected to the filter housing via pipes and flanges, wherein the container and the vacuum pump are located on opposite sides of the filter housing, an alarm is installed on the container, and a controller is installed on the vacuum pump, wherein the miniature pressure sensor and the alarm are both electrically connected to the controller.

[0015] As a preferred embodiment of the present invention, the controller is equipped with an anti-interference module, and the filter housing is provided with symmetrically distributed limiting blocks.

[0016] As a preferred technical solution of the present invention, it further includes a support base for supporting the filter housing, and a limiting groove adapted to the limiting block is formed in the bottom of the support base.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] Through the designed multi-stage filtration device, the metal mesh can filter larger particulate impurities, the activated carbon mesh can adsorb odors and some small molecule impurities in the gas, and the high-density sponge can further filter fine impurities. Multi-stage filtration improves the filtration effect.

[0019] The addition of a miniature pressure sensor allows for monitoring of gas pressure before and after filtration, providing data support for determining whether the filter components need to be replaced.

[0020] The support base provides support for the filter housing, and the limiting block and limiting groove cooperate to prevent the filter housing from shifting during operation, thus improving the stability of the overall structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the support structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the three-dimensional splicing structure of the filter housing and end cap of the present invention;

[0024] Figure 4 This is a partial cross-sectional view of the filter housing and end cap assembly of the present invention.

[0025] Figure 5 This is a schematic diagram of the control principle of the vacuum system of the present invention;

[0026] In the diagram: 1. Container; 11. Alarm; 2. Filter housing; 21. Miniature pressure sensor; 22. Limiting block; 23. Positioning groove; 3. Support base; 31. Limiting groove; 4. End cap; 41. Insert; 410. Metal mesh; 411. Activated carbon mesh; 412. High-density sponge; 42. Positioning block; 43. Threaded groove; 44. Through port; 440. Limiting ring; 5. Vacuum pump; 51. Controller; 6. Fixing lug; 7. Threaded cylinder; 8. Threaded rod. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] Please see Figures 1-4 This is the first embodiment of the present invention, which provides a filter for a vacuum system, comprising:

[0030] The filter housing 2 has an end cap 4 that can be detached from one end, allowing the end cap 4 and the filter housing 2 to be separated, thus improving the convenience of maintenance and replacement.

[0031] The multi-stage filtration device includes a tube 41 located at one end of the end cap 4, a metal mesh 410, an activated carbon mesh 411, and a high-density sponge 412 sequentially installed on the inner wall of the tube 41. The metal mesh 410 can filter larger particulate impurities, the activated carbon mesh 411 can adsorb odors and some small molecule impurities in the gas, and the high-density sponge 412 can further filter fine impurities. The multi-stage filtration improves the filtration effect. The tube 41 facilitates the overall installation and replacement of the multi-stage filtration components. Threaded grooves 43 are symmetrically installed at one end of the end cap 4. Fixing ears 6 are symmetrically arranged on the outer wall of the filter housing 2. A through hole is opened inside the fixing ear 6. A threaded rod 8 passes through the through hole. A threaded cylinder 7 is fixedly installed on the side surface of the fixing ear 6. The threaded rod 8 is threadedly connected to the threaded cylinder 7, and the threaded rod 8 is threadedly connected to the threaded groove 43. Through the cooperation of the threaded rod 8, the threaded cylinder 7, and the threaded groove 43, a stable connection between the end cap 4 and the filter housing 2 is achieved, which is convenient to disassemble and assemble and has high connection reliability.

[0032] Miniature pressure sensor 21: Two miniature pressure sensors 21 are provided and are respectively installed on filter housing 2 and end cap 4. They can monitor the gas pressure before and after filtration, providing data support for determining whether the filter component needs to be replaced.

[0033] In this embodiment, preferably, it also includes a through-hole 44 opened inside the end cap 4, and a limiting ring 440 installed on the inner wall of the through-hole 44 to limit the movement of the high-density sponge 412, which can effectively prevent the high-density sponge 412 from shifting during gas flow and ensure the stability of filtration.

[0034] In this embodiment, preferably, it also includes positioning blocks 42 symmetrically arranged on the end cap 4, and positioning grooves 23 symmetrically opened on the filter housing 2 that are adapted to the positioning blocks 42. The positioning blocks 42 and the positioning grooves 23 cooperate to facilitate the precise docking and installation of the end cap 4 and the filter housing 2, thereby improving the installation efficiency.

[0035] In this embodiment, preferably, the insert 41 and the end cap 4 are an integral structure, which enhances the connection strength between the insert 41 and the end cap 4 and reduces the possibility of loosening of the components. The threaded cylinder 7 and the fixing lug 6 are connected by screws, which facilitates the installation and replacement of the threaded cylinder 7.

[0036] In this embodiment, preferably, the fixing ear 6 and the filter housing 2 are welded together, which ensures the firmness of the connection between the fixing ear 6 and the filter housing 2. The height of the through hole and the threaded groove 43 are consistent, which ensures that the threaded rod 8 can pass smoothly through the through hole and connect with the threaded groove 43.

[0037] Example 2

[0038] Please see Figures 1-5This is the second embodiment of the present invention. This embodiment provides a vacuum system, including a filter, a container 1 connected to the filter housing 2 via pipes and flanges, and a vacuum pump 5. The container 1 and the vacuum pump 5 are located on opposite sides of the filter housing 2. The pipe and flange connection ensures the sealing of the connection, prevents gas leakage, and ensures the vacuum effect. An alarm 11 is installed on the container 1, and a controller 51 is installed on the vacuum pump 5. The miniature pressure sensor 21 and the alarm 11 are both electrically connected to the controller 51, which facilitates the transmission of pressure data and automatic control of alarms.

[0039] In this embodiment, preferably, the controller 51 is equipped with an anti-interference module to reduce the impact of external interference on the signal received and processed by the controller 51, and to ensure stable operation of the system. The filter housing 2 is provided with symmetrically distributed limiting blocks 22, which provide positioning and fixing functions for the installation of the filter housing 2 and enhance its stability.

[0040] In this embodiment, preferably, it also includes a support base 3 for supporting the filter housing 2, and a limiting groove 31 is formed in the bottom of the support base 3 to match the limiting block 22. The support base 3 supports the filter housing 2, and the limiting block 22 cooperates with the limiting groove 31 to prevent the filter housing 2 from shifting during operation, thereby improving the stability of the overall structure.

[0041] The specific implementation method of the anti-interference module is as follows:

[0042] Electromagnetic shielding technology: The internal circuit of the controller 51 adopts a double-layer electromagnetic shielding structure. The inner shielding cover is made of oxygen-free copper foil with a thickness of 0.3-0.5mm. Utilizing the excellent conductivity and magnetic shielding properties of copper, it forms a fully enclosed shielding space for the core circuit components (such as the microprocessor and signal conditioning chip). The shielding cover is tightly connected to the metal shell of the controller 51 with conductive adhesive to ensure no electromagnetic leakage gaps. The outer shielding layer is made of nickel-iron alloy (permalloy) material with a magnetic permeability of up to 8000-10000, which can effectively absorb low-frequency electromagnetic interference. The joints of the shielding layer adopt a mortise and tenon structure design and are filled with conductive foam to form a complete conductive path. The grounding resistance is controlled below 1Ω, and external electromagnetic signals (such as electromagnetic radiation generated by the vacuum pump 5 during operation and high-frequency noise in the industrial environment) are conducted to the ground through the grounding loop, reducing the interference intensity on the internal circuit.

[0043] The filtering circuit adopts a two-stage filtering architecture. The first stage is an RC low-pass filter circuit, connected in series between the signal input terminals of the miniature pressure sensor 21 and the controller 51. The resistor is a 1kΩ high-precision metal film resistor, and the capacitor is a 100nF ceramic chip capacitor, forming a low-pass filter with a cutoff frequency of 159Hz, which can filter out high-frequency noise (such as switching noise and radio frequency interference in the circuit) with a frequency higher than 159Hz. The second stage is an LC π-type filter circuit, which consists of a 1mH ferrite inductor and two 220nF electrolytic capacitors. The inductor is connected in series on the signal line, and the two capacitors are connected in parallel between the signal line and ground, forming a π-type topology. The cutoff frequency is set to 50Hz to further suppress 50Hz power frequency interference and harmonic components in the industrial power grid. The output terminal of the filter circuit is connected to an active filter chip (such as LMV841). Through the Butterworth low-pass filter network formed by the operational amplifier, the signal gain is adjusted (the gain factor is set to 2 times) while controlling the amplitude of the noise signal within 5mV.

[0044] Software Algorithm: A composite filtering algorithm of "median value-moving average" is adopted, with the data sampling frequency set to 100Hz, i.e., 100 sets of pressure data are collected per second. First, median value filtering is performed on every 5 consecutive sets of sampled data to remove extreme outliers (such as jump data caused by instantaneous electromagnetic pulses), retaining the middle 3 sets of valid data. Then, a moving average is calculated on 20 consecutive sets of valid data after median value filtering. That is, for each new set of data collected, the earliest set of data is removed, and the arithmetic mean of the latest 20 sets of data is taken as the current valid pressure value. Random fluctuations in the data are eliminated through smoothing. At the same time, a Kalman filter algorithm is embedded for dynamic noise suppression. The state equation and observation equation of the pressure data are established, and the process noise variance is set to 0.01 and the measurement noise variance is set to 0.1. Through a prediction-update iteration process, the measurement data is corrected in real time, so that the measurement error of the pressure data is controlled within ±0.2Pa, which significantly improves the stability and accuracy of the monitoring data of the miniature pressure sensor 21.

[0045] The specific method for accurate alarm is as follows: the miniature pressure sensor 21 monitors the gas pressure before and after filtration in real time and transmits the pressure data to the controller 51. The controller 51 has a preset pressure difference threshold and compares the real-time calculated pressure difference with the preset threshold. When the pressure difference exceeds the preset threshold, the controller 51 controls the alarm 11 to issue an audible and visual alarm to remind the filter component to be replaced. No manual judgment is required, which ensures the convenience and accuracy of the alarm.

[0046] The working principle and usage process of the present invention are as follows: The metal mesh 410, the activated carbon mesh 411, and the high-density sponge 412 are sequentially installed on the inner wall of the insert 41 at one end of the end cap 4, ensuring that the high-density sponge 412 is in close contact with the limiting ring 440, and its movement is limited by the limiting ring 440.

[0047] Align the positioning block 42 on the end cap 4 with the positioning groove 23 on the filter housing 2, move the end cap 4 toward the filter housing 2, so that the positioning block 42 is inserted into the positioning groove 23, and complete the initial positioning;

[0048] Pick up the threaded rod 8 and pass it through the hole inside the fixing ear 6. Then, thread one end of the threaded rod 8 to the threaded cylinder 7 and continue to rotate the threaded rod 8 until the other end of the threaded rod 8 is threaded to the threaded groove 43 on the end cover 4 and tightened, so as to achieve a stable connection between the end cover 4 and the filter housing 2.

[0049] Install the two miniature pressure sensors 21 into the preset positions of the filter housing 2 and the end cap 4 respectively, ensuring that the installation is secure and that the sensors can detect pressure normally;

[0050] Place the installed filter on the support base 3, so that the limiting block 22 on the filter housing 2 is embedded in the limiting groove 31 at the bottom of the support base 3, so as to achieve stable placement of the filter.

[0051] Connect container 1 to one end of filter housing 2 via pipes and flanges, and connect vacuum pump 5 to the other end of filter housing 2, ensuring that container 1 and vacuum pump 5 are located on both sides of filter housing 2, and that the connection between pipes and flanges is reliable and there is no gas leakage.

[0052] Install the alarm 11 at the preset position of the container 1, and install the controller 51 at the preset position of the vacuum pump 5;

[0053] Vacuum pump 5 starts working, and the gas in container 1 is extracted. The gas is filtered through metal mesh 410, activated carbon mesh 411, and high-density sponge 412.

[0054] During this process, two miniature pressure sensors 21 monitor the gas pressure before and after filtration in real time and transmit the pressure data to the controller 51.

[0055] The anti-interference module inside the controller 51 processes the received pressure data, removes interference, and ensures data accuracy. The controller 51 calculates the pressure difference before and after filtration in real time and compares it with a preset threshold. When the pressure difference does not exceed the preset threshold, the system operates normally without alarm prompts. When the filter component is blocked, causing the pressure difference to exceed the preset threshold, the controller 51 controls the alarm 11 to issue an audible and visual alarm to remind the user to replace the filter component.

[0056] Although embodiments of the invention have been shown and described in detail above, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filter for a vacuum system, characterized in that: include A filter housing (2), one end of which is detachably fitted with an end cap (4); A multi-stage filtration device, comprising a tube (41) disposed at one end of an end cap (4), a metal mesh (410), an activated carbon mesh (411), and a high-density sponge (412) sequentially disposed on the inner wall of the tube (41), a threaded groove (43) symmetrically disposed at one end of the end cap (4), a fixing ear (6) symmetrically disposed on the outer wall of the filter housing (2), a perforation opened inside the fixing ear (6), a threaded rod (8) passing through the perforation, and a threaded cylinder (7) fixedly disposed on the side surface of the fixing ear (6), wherein the threaded rod (8) is threadedly connected to the threaded cylinder (7), and the threaded rod (8) is threadedly connected to the threaded groove (43); Miniature pressure sensor (21), two of which are installed on the filter housing (2) and the end cap (4) respectively.

2. A filter for a vacuum system according to claim 1, characterized in that: It also includes a through-hole (44) opened inside the end cap (4) and a limiting ring (440) installed on the inner wall of the through-hole (44) to limit the movement of the high-density sponge (412).

3. A filter for a vacuum system according to claim 1, characterized in that: It also includes positioning blocks (42) symmetrically arranged on the end cap (4) and positioning grooves (23) symmetrically opened on the filter housing (2) that are compatible with the positioning blocks (42).

4. A filter for a vacuum system according to claim 1, characterized in that: The insert (41) and end cap (4) are an integral structure, and the threaded cylinder (7) and fixing lug (6) are connected by screws.

5. A filter for a vacuum system according to claim 1, characterized in that: The fixing ear (6) and the filter housing (2) are welded together, and the perforation and threaded groove (43) are at the same height.

6. A vacuum pumping system, characterized in that: The filter includes the filter as described in any one of claims 1-5, and further includes a container (1) and a vacuum pump (5) connected to the filter housing (2) via pipes and flanges, wherein the container (1) and the vacuum pump (5) are located on opposite sides of the filter housing (2), an alarm (11) is installed on the container (1), and a controller (51) is installed on the vacuum pump (5), wherein the miniature pressure sensor (21) and the alarm (11) are both electrically connected to the controller (51).

7. A vacuum system according to claim 6, characterized in that: The controller (51) is equipped with an anti-interference module, and the filter housing (2) is provided with symmetrically distributed limiting blocks (22).

8. A vacuum system according to claim 7, characterized in that: It also includes a support base (3) for supporting the filter housing (2), and a limiting groove (31) is opened in the bottom of the support base (3) to match the limiting block (22).

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